Synthesis and light‐emitting properties of a novel π‐conjugated poly[di(p‐phenyleneethynylene)‐alt‐ (p‐phenylenecyanovinylene)] containing n‐octyloxy side branches

Abstract

A novel p-conjugated poly[di(p-phenyleneethynylene)-alt-(p-phenylenecyanovinylene)] having n-octyloxy side chains (PPE-C 8 PPE-PPV) was prepared by polymerization of the monomer DEDB with BCN. Chemical structure of the polymer obtained was confirmed by 1 H NMR, FTIR, and EA. PPE-C 8 PPE-PPV had a molecular weight enough to fabricate the electroluminescent (EL) device, and showed a good organosolubility, excellent thermal stability, and film-forming property. In UV absorption and PL spectra in film it showed a maximum at 430 and 543 nm, respectively, which appeared 5 and 41 nm longer wavelengths than that of the solution, respectively. HOMO, LUMO energy levels and band gap were determined to be 25.70, 23.29, and 2.41 eV, respectively. Two EL devices with low-work function cathodes were fabricated with the structures of ITO/PEDOT/PPE-C 8 PPE-PPV/cathodes (LiF/Al and Mg:Ag/Ag). The both devices exhibited a bright green light emission at 545 nm and the maximum luminescence of 197 cd/cm 2 (LiF/Al) and 158 cd/cm 2 (Mg:Ag/Ag).

Novel 1,4‐diketo‐3,6‐diphenyl pyrrolo[3,4‐c]pyrrole (DPP)‐based copolymers with large Stokes shift

“…Common Heck reaction could be completed between the active H atom in the vinyl or ethynyl group with aryl halides, but alternating copolymers could be prepared via cross‐coupling polycondensation with bis(triphenylphosphine) dichloropalladium (Pd(PPh 3 ) 2 Cl 2 ) and phase transfer catalyst (BTEAC) 47, 48. In this reaction, deacetonation of the dibutynol intermediate was realized in the presence of alkali 49…”

Crystal structure of 1,4-dibutoxy-2,5-diethynylbenzene, C18H22O2

“…Thecommonly used strategy to enhance solubility is the introduction of lateral chains to the benzene ring [9].So, the title compound is an important intermediate in synthesizing these polymers. Up to now, only the synthesis of the title compound has been reported [1].But the crystal structure of it has not been reported in open literature. The title compound has asymmetrical molecule.…”

Novel poly(phenylene ethynylene)‐type conjugated polymers containing diketopyrrolopyrrole or triphenylpyrazoline units in the main chain: synthesis, characterization and photophysical properties

“…Monomer 1 was prepared by modifying a procedure described in the literature 24. Typically, in a 100 mL three‐necked round‐bottom flask equipped with a reflux condenser, thermometer and nitrogen gas inlet, 2,5‐di( n ‐decyloxy)‐1,4‐bis(3‐methyl‐3‐hydroxybut‐1‐ynyl)benzene (2.77 g, 5 mmol) and dry toluene (50 mL) were added.…”